Southern Yellow Pine OSHA planks are sourced in the southeast United States. Planks will have all four corners clipped on a 45 deg angle 2" from the end of the plank, and 8 mm steel rods are inserted through the width of the planks on both ends, which greatly reduces splits and warping during use. Comes stamped with official SPIB grade stamp and OSHA Plank is hand stamped onto their sides.